AD 47-20-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Univair Aircraft Corporation | 415-C | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-CD | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-D | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
Unsafe Condition
Failure of the voltage regulator to maintain proper charging rate of the battery, leading to potential battery overcharging or undercharging.
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Required Actions
Check the voltage regulator operation by observing the ammeter reading after engine start until the battery is charged. Ensure the charging rate is 11-13 amperes for up to 20 minutes post-start, then reduces to 2 amperes or less within 2 hours of operation.
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Compliance Time
At each 100-hour inspection and immediately after each electrical system malfunction.
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Affected Aircraft
Univair Aircraft Corporation Model 415-C, 415-CD, and 415-D aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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